Spectroscopic study on the transition of the trans-2-methylvinoxy radical

Electronic excitation spectra of the B ̃ 2 A ″ - X ̃ 2 A ″ transition of the trans-2-methylvinoxy radical were observed in the region of 29 000–32 000 cm−1 by laser-induced fluorescence and fluorescence depletion spectroscopy. Fourteen vibronic bands observed in the depletion spectrum were unambiguously identified to be originating from the radical. Dispersed fluorescence spectra from three different vibronic levels were also obtained, and a total of 69 emission bands were assigned, yielding the ground state vibrational constants.